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Study on Hydrogen Diffusion Behavior during Welding of Heavy Plate.

Jianguo Yang1, Guohao Liu1, Wenjian Zheng1

  • 1College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

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|September 9, 2020
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Solid-state phase transition (SSPT) significantly impacts hydrogen diffusion during heavy plate welding, influencing cold cracking risks. Understanding this hydrogen behavior is crucial for preventing weld defects.

Keywords:
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Area of Science:

  • Materials Science
  • Metallurgy
  • Welding Engineering

Background:

  • Heavy plate welding involves complex multi-layer, multi-pass processes.
  • Hydrogen-induced cracking is a critical concern in welded structures.
  • Residual stresses and phase transformations influence hydrogen behavior.

Purpose of the Study:

  • To numerically simulate hydrogen diffusion during heavy plate welding.
  • To investigate the effects of solid-state phase transition (SSPT) on hydrogen diffusion.
  • To analyze the influence of residual stress on hydrogen redistribution.

Main Methods:

  • Numerical simulation of hydrogen diffusion in the thickness direction.
  • Comparison of simulation results with experimental data.
  • Analysis of residual stress distribution and its effect on hydrogen migration.

Main Results:

  • Simulated hydrogen concentration distribution agreed well with experimental findings.
  • High hydrogen concentration, leading to cold cracking sensitivity, was observed at 20-30 mm depth.
  • SSPT altered residual stress, causing hydrogen redistribution and an upward diffusion self-gathering effect in the weld metal.

Conclusions:

  • SSPT significantly affects hydrogen diffusion dynamics and residual stress profiles in heavy plate welds.
  • The self-gathering effect of hydrogen is short-range and pass-dependent.
  • Controlling hydrogen diffusion and residual stress is vital for mitigating cold cracking in heavy plate welding.